another concern, a 1/2 inch section of arm got bitten off and propelled out of his conch shell "den". all of the parameters are fine but i did a small water change anyway. the new starfish(sand sifter) might be stressing him out but i think boredom is more likely so i boiled a couple of plastic balls and put them in the tank. hes still resting in his conch shell as usual so i don't know what he will think of the toys. hopefully they wont stress him further...

another concern, a 1/2 inch section of arm got bitten off and propelled out of his conch shell "den". all of the parameters are fine but i did a small water change anyway. the new starfish(sand sifter) might be stressing him out but i think boredom is more likely so i boiled a couple of plastic balls and put them in the tank. hes still resting in his conch shell as usual so i don't know what he will think of the toys. hopefully they wont stress him further...

another 1/2 inch portion of arm just got bit off :/

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Hmm.. are you saying crabs are taking the arm tips off or do you think the octopus is severing them?